Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d3610c453c3130…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 21:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 70db16d1118d8636fbeb0da1149fdb17 SHA-1: 4c1af27ee187be6c2d083034f11c53b4026816d0 SHA-256: a9d3610c453c313077c0ef0d1a16baf67fdb0c87b4009b885a4d5d82d6593582
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=cool+math+games+run+3+unblocked PDF link annotation
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/17278635432.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/50426427707.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/fadovitujakugulubumipuwok.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/lopovemowitotikomemap.pdfIn PDF document text
    • https://termoformat.md/img/files/pavololapawop.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/78021584440.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/dofekokavimexorasalavuli.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/4044050338.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/67419593157.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/finagaxedabubemudab.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/28979839834.pdfIn PDF document text
    • http://protok.pro/upload/files/72892004763.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/82120570303.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/53442248627.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jugodijetosizedudikimuni.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/92877094378.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/73574684242.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/dugodotegimu.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/jarevuzo.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/66479970206.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133208c9211b---jonerurewitex.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/77790680394.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/bomemisulasipid.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/zimaxutudor.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44E 16296 bytes
SHA-256: 45478a6008a9d1c6329872f593dc6c56ed6f66ab833a363a0736bf17415c905f
font_01_sfnt_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 11260 bytes
SHA-256: 36dd3e71f6432411bacdc8a48a4ed7b6029987be737c8810402887ed4d614bd8
font_02_sfnt_off000117dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1